Fu Yu, Liu Linshu, Zhang Jinwen
School of Mechanical and Materials Engineering, Composite Materials and Engineering Center, Washington State University , Pullman, Washington 99164, United States.
ACS Appl Mater Interfaces. 2014 Aug 27;6(16):14069-75. doi: 10.1021/am503283f. Epub 2014 Jul 11.
This study aimed to enhance the conductive properties of PLA nanocomposite by controlling the dispersion and distribution of graphene within the minor phase of the polymer blend. Functionalized graphene (f-GO) was achieved by reacting graphene oxide (GO) with various silanes under the aid of an ionic liquid. Ethylene/n-butyl acrylate/glycidyl methacrylate terpolymer elastomer (EBA-GMA) was introduced as the minor phase to tailor the interface of matrix/graphene through reactive compatibilization. GO particles were predominantly dispersed in PLA in a self-agglomerating pattern, while f-GO was preferentially located in the introduced rubber phase or at the PLA/EBA-GMA interfaces through the formation of the three-dimensional percolated structures, especially for these functionalized graphene with reactive groups. The selective localization of the f-GO also played a crucial role in stabilizing and improving the phase morphology of the PLA blend through reducing the interfacial tension between two phases. The establishment of the percolated network structures in the ternary system was responsible for the improved AC conductivity and better dielectric properties of the resulting nanocomposites.
本研究旨在通过控制石墨烯在聚合物共混物次要相中的分散和分布来提高聚乳酸（PLA）纳米复合材料的导电性能。功能化石墨烯（f-GO）是通过在离子液体的辅助下使氧化石墨烯（GO）与各种硅烷反应而制得的。引入乙烯/丙烯酸正丁酯/甲基丙烯酸缩水甘油酯三元共聚物弹性体（EBA-GMA）作为次要相，通过反应性增容来调控基体/石墨烯的界面。GO颗粒主要以自团聚的方式分散在PLA中，而f-GO则通过形成三维渗滤结构优先位于引入的橡胶相或PLA/EBA-GMA界面处，特别是对于这些带有反应基团的功能化石墨烯。f-GO的选择性定位在稳定和改善PLA共混物的相形态方面也起着关键作用，这是通过降低两相之间的界面张力实现的。三元体系中渗滤网络结构的建立是所得纳米复合材料交流电导率提高和介电性能改善的原因。
